RAL Tier1 Experiments Liaison Meeting

Wednesday 4 Mar 2026, 13:30 → 15:50 Europe/London

Access Grid (RAL R89)

13:30 → 13:34 Site Operations

13:34 → 13:35 Experiment Operational Issues

13:35 → 13:40 ATLAS Operations Report

Speakers: Brij Kishor Jashal (Rutherford Appleton Laboratory), Jyoti Prakash Biswal (Rutherford Appleton Laboratory)

ATLAS liason meeting notes Brij

13:40 → 13:45 CMS Operations Report

Speaker: Katy Ellis (Science and Technology Facilities Council STFC (GB))

Another quiet week. 

CE upgrades ongoing with scheduled downtime. Still seeing very intermittent SAM test failures which I had hoped would be fixed by the upgrade but this is not the case. I still see the occasional 'timeout' error, and also 'Held job / job not found'.

Job efficiency is a little bit lower this week than normal, but this is consistent with other T1s.

A couple of narrow spikes in the job input read time on 3rd March, but these are User Analysis jobs. 

13:45 → 13:50 LHCb Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

News:

• DIRAC PR that allows local separation of local and external storage endpoints have been approved. That means we can expect deployment of writeable WN changes (in DIRAC) soon (with the next release).
  
  

Issues:

• Issues with xrootd gateway on one of the WNs on Monday, caused some download failures. Fixed by restart. Very minor impact.

13:50 → 13:55 ALICE Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

Alice  has significantly exceeded its allocation on ECHO. That's partially because of the broken xrootd accounting. Seems like cmsd is not redirecting query requests to the gateways (and unable to server the requests itself). It is also not contactable from CERN via IPv6 (expected with the current VM setup, should be fixed after proxmox migration).

The issue is tracked in GRIDPP-6033 

13:55 → 14:00 LSST Operations Report

Speakers: Mathew Sims, Timothy Noble (Science and Technology Facilities Council STFC (GB))

14:00 → 14:01 Tier-1 Projects

14:02 → 14:07 Anatares Upgrade

Speakers: George Patargias, Thomas Byrne

14:08 → 14:13 XRootD Development

Speakers: Alexander Rogovskiy (Rutherford Appleton Laboratory), Jyothish Thomas (STFC)

14:14 → 14:19 Utilizing GPUs

Speakers: Jyoti Prakash Biswal (Rutherford Appleton Laboratory), Thomas Birkett

14:20 → 14:25 SSD Storage Evaluation

14:25 → 14:26 AOB

14:27 → 14:36 Summary of Operational Status and Issues

Speakers: Brian Davies (Science and Technology Facilities Council STFC (GB)), Darren Moore

Weekly Report 04 March 2026.docx

Weekly Report 04 March 2026.pdf

14:45 → 14:50 Any other Business

Speakers: Brian Davies (Science and Technology Facilities Council STFC (GB)), Darren Moore